http://news.bbc.co.uk/2/hi/americas/7973274.stmPresident Obama's security bubble
By Max Deveson
BBC News, Washington
You can take the man out of the White House. But you can't take the White House away from the man.
President Obama's customised limousine, nicknamed "The Beast"
"The Beast" - the president's customised limousine
And US President Barack Obama has arrived in London for the G20 summit with a large contingent of the White House staff with him.
Hundreds of security guards, doctors, chefs and others are accompanying President Obama on his visit, and the entourage includes a number of presidential vehicles - including his new armour-plated limousine, The Beast, and aeroplane, Air Force One.
The 4,000 sq ft Boeing 747 is fully equipped for the president to work while he is in the air. The exercise-loving president will even be able to use the onboard gym to keep fit inflight.
The plane is fitted with some robust security equipment including shields to protect its instruments from an electromagnetic pulse. The communications equipment is even capable of withstanding radiation from a nuclear attack.
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